Last Updated: July 31, 2012 5:25pm
Great Britain's Rajiv Ouseph and Susan Egelstaff both saw their respective Olympic bids come to an end in the badminton singles on Tuesday.
Men's singles hopeful Ouseph missed out as Guatemala's Kevin Cordon came from behind to beat him in a three-game thriller.
Ouseph, the world number 25, trailed by three points early in a tense third game but recovered to lead 14-11, only to fire a simple winner into the net.
That reprieve gave 38th-ranked Cordon belief to go on and he edged across the line 12-21 21-17 21-19.
Ouseph said: "I was trying to keep a lead. It would have been nice towards the end if I could have done that but it got very tight at the end. He just played the last couple of points better."
Egelstaff's campaign ended after a battling defeat to Japan's Sayaka Sato.
The Scot benefited from some dubious line calls as she took early control but Sato, who initially seemed rattled after complaining about decisions, recovered to win 18-21 21-16 21-12.
Egelstaff had an opportunity to push for victory in the second game but, at 16-15 down, her opponent produced a fine drop shot and did not look back as she closed out a place in the last 16.
It was still a valiant effort from world number 38 Egelstaff against a player ranked 22 places above her, the Briton having recovered from a serious leg injury to compete.
Egelstaff broke away in the first game with a run of six successive points but Sato complained increasingly furiously over two line calls.
For the second one, at least, it seemed she had a point after an Egelstaff shot that appeared to land just out was called in.
Perhaps still bothered by the incidents, she made a number of mistakes and Egelstaff brought up five game points.
The Glaswegian lost three of them but converted at the fourth attempt to establish an early advantage.
Sato was on the wrong end of another controversial line call early in the second game. Although she complained again, this time Sato maintained her composure to open up a six-point lead.
Egelstaff refused to bow and forced Sato to start making errors again and clawed back within one.
Sato's body language suggested she felt nothing was going her way but mistakes on Egelstaff's part then allowed her to level the match.
The third game was tense but Sato began to look the more convincing player and found more winners as she eventually powered away.
Egelstaff was proud of her performance and had no complaints about the result.
The 29-year-old missed four months of the qualifying campaign after shattering her thigh bone last October and was pleased just to have made it to the Games.
She said: "I'm disappointed to lose but I feel like I gave it everything. I don't think I could have given any more.
"I played really well but I couldn't have done anything else, she was just a bit better than me at the end."
Egelstaff felt some of Sato's antics bordered on gamesmanship but was not concerned and did not let the line controversies affect her.
She said: "I got some excellent line calls! I am not calling the lines, what can you do?
"I complain as well sometimes. Good players are not going to let runs of points go against them, they are going to try something.
"I coped with that okay. Sometimes it can be a distraction but it is part of sport, gamesmanship. I'd probably do the same."
Ireland's Chloe Magee bowed out of the women's singles competition despite a superb performance against former world number two Pi Hongyan.
Magee claimed an early lead in what was effectively a shoot-out for a place in the last 16 but Pi, of France, recovered to win 16-21 21-18 21-14.
Helen Glover & Heather Stanning won Britains' first gold of London 2012 with a dominant rowing win at Eton Dorney.
Check out our choice of the highlights from day four of the Games and share your thoughts...
Team GB's eventing team salute the support they received as they landed silver medals on home turf.
DOB: 17/5/1956 Event: Boxing Medals: 1 gold Flag: USA
A week into the Games of the XXX Olympiad, Richard Moore brings us his half-way highs and lows
Linford Christie sprinted to 100m gold for Britain at an Olympic Games best remembered for America's basketball dream team.